package map;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class MapDemo3 {
    public static void main(String[] args) {
        Map<String,Integer> map = new HashMap<>();
        map.put("语文",99);
        map.put("数学",100);
        map.put("英语",70);
        map.put("物理",100);
        System.out.println(map);

        Set<String> keyset = map.keySet();
        for(String key:keyset){
            System.out.println("key:"+key);
        }
        Collection<Integer> values = map.values();
        for(Integer value :values){
            System.out.println("value:"+value);
        }
        Set<Map.Entry<String,Integer>> entry = map.entrySet();
        for(Map.Entry<String,Integer> entry1 :entry){
            System.out.println(entry1);
        }
    }
}
